czk = {"name": "czk",
       "age": 27,
       "sex": "男"}

# 长度
print(len(czk))

nzq = {"name": "nzq",
       "age": 26,
       "sex": "女"}

# 合并字典，相同的key会被覆盖
czk.update(nzq)
print(czk)

# 清空字典
czk.clear()
print(czk)
